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Finding the Fourth Proportional to 1,200.20, 1,800.36 and 551.39

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Solution

The fourth proportional to 1,200.20, 1,800.36 and 551.39 is: 827.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.20 : 1,800.36 = 551.39 : x
  2. Step 2: Convert to fraction form
    1,200.20/1,800.36 = 551.39/x
  3. Step 3: Cross multiply
    1,200.20x = 1,800.36 × 551.39
  4. Step 4: Simplify right side
    1,200.20x = 992,691.50
  5. Step 5: Solve for x
    x = 992,691.50/1,200.20
  6. Step 6: Final answer
    x = 827.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.